Question 11.24 How would you explain the lower atomic radius of Ga as compared to Al?
Class XI The p-Block Elements Page 324
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Electronic configuration of Al : ₁₃Al = 1s²,1s²,2p⁶,3s²,3p¹
Electronic configuration of Ga : ₃₁Ga = 1s²,2s²,2p⁶,3s²,3p⁶,3d¹⁰,4s²,4p¹
The screening tendency of d - electrons is poor. thus, on moving from Al to Ga, shielding effect of 10 electrons is unable to compensate increase nuclear charge. Therefore, atomic radius of Ga is smaller than that Aluminium due to effective nuclear charge.
Electronic configuration of Ga : ₃₁Ga = 1s²,2s²,2p⁶,3s²,3p⁶,3d¹⁰,4s²,4p¹
The screening tendency of d - electrons is poor. thus, on moving from Al to Ga, shielding effect of 10 electrons is unable to compensate increase nuclear charge. Therefore, atomic radius of Ga is smaller than that Aluminium due to effective nuclear charge.
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